Large wireless network

I was wondering if it possible to build a large wireless LAN and if the quality of it would be acceptable. The plan is to have a Lan party for about 60 PCs (and 2 or 3 servers). Most of these PCs have already a wireless device (802.11g) so it would be great to avoid cables. What APs are best for this application and which mode should be used?Has anyone tried something similar?Thank you very much!